Perhaps you should try some spelling variations:
"oecd economic department working papers" » "oecd economics department working papers", "oecd academic department working papers", "oecd economic treatment working papers", "oecd economic departments working papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department working paper"
"oecd economic department boarding papers" » "oecd economics department boarding papers", "oecd academic department boarding papers", "oecd economic treatment boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department providing papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department marking papers"
"oecd economic experiment working papers" » "oecd economic experiments working papers", "oecd economics experiments working papers", "oecd economic empowerment working papers", "oecd economic experimental working papers", "oecd economic experiment wirkung papers", "oecd economic experiment working paper"
"oecd economic debasement working papers" » "oecd economic measurement working papers", "oecd economic appeasement working papers", "oecd economic management working papers", "oecd economic statement working papers", "oecd economic deployment working papers", "oecd economic debasement working paper"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("oecd economic department working papers") OR ("oecd economic experiment working papers"))) OR ("oecd economic debasement working papers"))) OR ("oecd economic department boarding papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economic department working papers\") OR (\"oecd economic experiment working papers\"))) or (\"oecd economic debasement working papers\"))) or (\"oecd economic department boarding papers\"))".
• Removing quotes may allow a broader search: (((((( oecd economic department working papers ) OR ( oecd economic experiment working papers ))) or ( oecd economic debasement working papers ))) or ( oecd economic department boarding papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic department working papers") OR ("oecd economic experiment working papers"))) or ("oecd economic debasement working papers"))) or ("oecd economic department boarding papers"))*.